can't mount /oem/apps for rw

I have a cheapie Emerson EM543 ICS tablet. it comes rooted so removing most of the bloat was easy enough but there's still four more apks that I'd like to get rid of. they are located in /oem/apps and I can't remount it for rw. here's the cat /procs/mount listing for /oem:

/dev/block/nandi /oem cramfs ro,relatime 0 0

I've tried mount mount -o remount,rw -t cramfs /dev/block/nandi /oem but it didn't work. does anyone have any ideas on how to do this?